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(11)

EP 2 104 645 A1

(12)

(43) Date of publication: 30.09.2009 Bulletin 2009/40 (21) Application number: 06848328.8 (22) Date of filing: 28.12.2006

(51) International Patent Classification (IPC):  C01G 23/053(2006.01) C01G 49/02(2006.01) C01G 23/08(2006.01) C22B 34/12(2006.01) (86) International application number: PCT/US2006/049556 (87) International publication number: WO 2008/082384 (10.07.2008 Gazette 2008/28)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (71) Applicant: E. I. Du Pont de Nemours and Company Wilmington, DE 19898 (US)

(72) Inventors: HUTCHENSON, Keith, W. Lincoln University, Pennsylvania 19352 (US) LI, Sheng Elmhurst, New Jersey 11373 (US) CORBIN, David, Richard West Chester, Pennsylvania 19380 (US) TORARDI, Carmine Wilmington, Delaware 19810 (US) SHIFLETT, Mark, Brandon New Castle, Delaware 19720 (US) ZAHER, Joseph, J. Newark, Delaware 19711 (US) GRIFFIN, Thomas, Paul Kennett Township, Pennsylvania 19317 (US) (74) Representative: Matthews, Derek Peter  Frank B. Dehn & Co. St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)